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A kind of preparation method of porous wood carbon modified metal lithium negative electrode material

A technology of negative electrode material and metal lithium, which is applied in the field of preparation of modified lithium metal negative electrode materials, can solve the problems of low coulombic efficiency and short cycle life of batteries, achieves simple and convenient preparation method, improves cycle life, and inhibits uncontrollable deposition behavior. Effect

Active Publication Date: 2020-10-02
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at a series of problems existing in the metal lithium negative electrode, the present invention provides a preparation method of a porous wood carbon modified metal lithium negative electrode material, which can effectively solve the problem caused by the growth of metal lithium dendrites in the lithium metal negative electrode material during battery charging and discharging. The battery Coulombic efficiency is low, the cycle life is short, etc.

Method used

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  • A kind of preparation method of porous wood carbon modified metal lithium negative electrode material
  • A kind of preparation method of porous wood carbon modified metal lithium negative electrode material
  • A kind of preparation method of porous wood carbon modified metal lithium negative electrode material

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Embodiment 1

[0035] A kind of natural multilevel porous balsawood carbon modified metal lithium negative electrode material, its preparation method comprises the following steps:

[0036] (1) Get cross-cut balsa wood, cut into 1.2cm, wide 1.2cm, and thickness is the wood chip of 0.05cm;

[0037] (2) The balsa wood chips obtained in step (1) are heated to 300° C. for carbonization at a rate of 5° C. / min under a protective atmosphere, heat-insulated for 4 hours, then heated to 700° C. for activation at 5° C. / min, and heat-insulated for 2 hours. Obtain activated balsa wood carbon material (WC);

[0038] (3) 0.25g zinc nitrate is dissolved in 50mL ethanol, obtains the zinc nitrate ethanolic solution of 5mg / mL;

[0039] (4) Take 0.1 g of activated balsa charcoal obtained in step (2) and soak in the solution obtained in step (3) for 1 h. After taking it out, put it into a nitrogen-filled tube furnace, put 0.3g of polytetrafluoroethylene (PTFE) powder into a ceramic boat and place it in front of ...

Embodiment 2

[0042] A kind of natural multi-level porous balsa wood carbon modified metal lithium negative electrode material, its preparation method comprises the following steps: (1) get cross-cut balsa tree wood, cut length 1.2cm, width 1.2 centimeters, thickness is 0.05cm wood chips;

[0043] (2) The balsa wood chips obtained in step (1) are heated to 300° C. for carbonization at a rate of 5° C. / min under a protective atmosphere, heat-insulated for 4 hours, then heated to 700° C. for activation at 5° C. / min, and heat-insulated for 2 hours. Obtain activated balsa wood carbon material (WC);

[0044] (3) 0.25g magnesium acetate is dissolved in 50mL ethanol, obtains the magnesium acetate ethanol solution of 5mg / mL;

[0045] (4) Take 0.1 g of activated balsa charcoal obtained in step (2) and soak in the solution obtained in step (3) for 1 h. After taking it out, put it into a nitrogen-filled tube furnace, put 0.3g of polytetrafluoroethylene (PTFE) powder into a ceramic boat and place it i...

Embodiment 3

[0049] A kind of natural multilevel porous balsawood carbon modified metal lithium negative electrode material, its preparation method comprises the following steps:

[0050] (1) get cross-cut balsa wood, cut into 1.2cm, wide 1.2cm, thickness is the wood chip of 0.05cm;

[0051] (2) The balsa wood chips obtained in step (1) are heated to 300° C. for carbonization at a rate of 5° C. / min under a protective atmosphere, heat-insulated for 4 hours, then heated to 700° C. for activation at 5° C. / min, and heat-insulated for 2 hours. Obtain activated balsa wood carbon material (WC);

[0052] (3) 0.25g aluminum nitrate is dissolved in 50mL ethanol, obtains the aluminum nitrate ethanol solution of 5mg / mL;

[0053] (4) Take 0.1 g of activated balsa charcoal obtained in step (2) and soak in the solution obtained in step (3) for 1 h. After taking it out, put it into a nitrogen-filled tube furnace, put 0.3g of polytetrafluoroethylene (PTFE) powder into a ceramic boat and place it in front...

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Abstract

A preparation method of a porous wood carbon modified metal lithium anode material comprises that following steps: (1) taking wood of transverse cut balsa wood, cutting into wood chips; (2) carbonizing and activating the balsa wood chips at high temperature in a protective atmosphere to obtain activated balsa wood carbon material; (3) preparing a metal nitrate or metal acetate solution, and soaking the balsa wood carbon material in the solution for 1-3h, and then putting the material into a tubular furnace, loading the polytetrafluoroethylene powder into a ceramic boat and placing the polytetrafluoroethylene powder on the front part of the air inlet, and calcining the polytetrafluoroethylene powder at high temperature to obtain a metal fluoride modified balsa wood carbon material; and (4)depositing metal lithium into the pore channel structure of the metal fluoride modified balsa wood carbon material by electrodeposition under the protection of argon gas, thereby obtaining the modified metal lithium anode material. The invention can effectively solve the problems of low coulomb efficiency and short cycle life of the battery caused by the growth of metal lithium dendritic crystal in the charging and discharging process of the battery of the metal lithium negative electrode material.

Description

[0001] (1) Technical field [0002] The invention belongs to the field of lithium batteries and relates to a preparation method of a modified metal lithium negative electrode material. [0003] (2) Background technology [0004] With the rapid expansion of the portable electric device and electric vehicle market, the demand for lithium-ion batteries with high energy density and high power density is also increasing. However, traditional anode materials such as graphite have a theoretical capacity of only 372mAh g -1 , it is difficult to meet the needs of development. This situation has greatly promoted the design and development of high-performance anode materials. Lithium metal anode is a promising anode material with a theoretical capacity as high as 3860mAh g -1 , is ten times the capacity of graphite. Moreover, lithium metal has an extremely low standard electrode potential and good internal conductivity. However, lithium metal also has some problems. Due to its activ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/1395H01M10/052C01B32/05
CPCC01B32/05H01M4/1395H01M4/362H01M4/382H01M4/628H01M10/052H01M2004/027Y02E60/10
Inventor 陶新永金成滨盛欧微罗剑敏袁华栋居治金
Owner ZHEJIANG UNIV OF TECH
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